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Dyno Tuning

When the SR20 engine was first re-built, it was dyno tuned so it would run correctly but nothing much was done to extract a lot of horse power. It produced 235 HP at the rear wheels.

March 2014 : After fitting a Haltech Wideband O2 sensor and a Haltech Boost Control Solenoid it was time to have the engine dyno tuned again to extract some more power. The first runs proved the engine was still producing the same HP curve then 2 Key parameters wer changed.

1) The VVT was enabled - This gave an extra 30 HP at the rear wheels around 4000 RPM with very little impact on the maximum HP @ 6500 RPM

2) The boost was increased from a flat 11 PSI to 16 PSI @ 4000 RPM with a roll off to 14.5 PSI at 6500 RPM. This added an extra 70 HP @ 4000 RPM and 40HP @ 6500 RPM - Total increase of 100HP @ 4000RPM.

The graph shows the original HP and Boost in Red and the new HP and Boost in blue. Whist there is no RPM scale to go by, 4000 RPM is around 116 KPH and 6500 RPM is around 188 KPH.

August 2014 : Since the previous dyno session I had fixed several leaks in the turbo plumbing which had slowly increased the boost pressure. I ended up blowing the turbo to pieces and whilst no one can give me a definative reason why the Turbo failed the cause of failure was clearly overheating so I decided the engine tune needed some more extensive investigation. The guys at Signature Performance found a few more leaks around the throttle body. I also had a Haltech intakle air sensor fitted and the OEM water temp sensor replaced with a Haltech item. Testing revealed a dicky injector and an intermittent electrical fault on the CAS. New Injectors have been fitted and the CAS connector replaced.

September 2017 : The engine was stripped down and checked for any possibel issues. Nothing nasty was found during the strip down rebuild but a few minor changes were made internally. A fresh Dyno Tune seemed like the right thing to do and this time we achived a result of 298HP on standard boost. I decided to leave it on standard boost untill I can upgrade to bigger injectors and E85